Well it can be frustrating in some cases, because you have to clean up other peoples messes. Then you run into bad design decisions, laziness, obvious non-cari

Well it can be frustrating in some cases, because you have to clean up other peoples messes. Then you run into bad design decisions, laziness, obvious non-caring about the code quality or other negative behaviors that angers you. And before you go into you don't understand their constraints and so on, this applies to people who you fully well know their design and time constraints, yet still do the wrong thing while you haven't under the same constraints. It's the whole 'hell is other people's code', and 'let's rewrite this piece of shit' tropes that programmers go through.